Electric bell



(No Model.)

H. B. PORTER.

ELECTRIC BELL. N0. 320,685. Patented J-unaZB, 1885.

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UNITED STATES PATENT OFFICE.

HENRY B. PORTER, OF CHICAGO, ILLINOIS.

ELECTRIC BELL.

QIEQIPIGATIDN forming part of Letters Patent No. 320,685, dated June 23, 1885.

(No model.)

To all whom it may concern.-

Be it known that I, HENRY B. PORTER, a citizen of the United States, residing at Chicago, in the county ofCook and State of Illinois, have invented certain new and useful Improvements in Electric Bells; and I do hereby declare the following to be a full, clear, and eX-,

act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain novel and useful improvements in electric bells, and has for its object to improve on the construction shown in Patents Nos. 214,261 and 261,172, granted to me April 15, 1879, and July 18, 1882, respectively; and with these ends in view my invention consists in the details of construction and combination of elements hereinafter fully explained, and then specifically designated by the claims.

In order that those skilled in the art to which my invention appertains may more fully understand its construction and operation,l will proceed to describe the same in detail, referring by letter to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a side elevation of my improvement with the bell broken away; Fig. 2, a plan view with the bell removed; Fig. 3, a bottom View, and Fig. 4 an end view.

Similar letters denote like parts in the several figures of the drawings.

I will not enter into any detailed description of the helix and the relation of the armature to the poles thereof, as this is fully described in my previously-mentioned patents, and moreover forms no part of my present invention.

A is the helix, and B G the poles of the magnet. The helix is set within a frame, D, and secured thereto by a yoke, E, embracing said helix and fastened to the frame by means of screws F, or in any other suitable manner.

G is a post which projects upwardly from the top of the yoke, being cast integral therewith. This post has a screw-hole in its end, and the bell H is secured thereto by means of screw 1, as seen at Fig. 1.

J are lugs depending from the bottom of the frame, (see Figs. 1 and 3,) and between them is pivoted the armatureK by means of screws L. This armature is U-shaped, and its arms extend upward in a vertical plane, so as to be in proximity to the poles B O in order to be attracted thereto.

M is a circuit-breaker, which I preferably make flexible and attach in any suitable way to the armature K.

N is a lug, which is cast integral with the frame and extends upwardly therefrom. O is a screw, which is passed through said log and is insulated therefrom by hard-rubber disks P.

Q is a washer, of copper or other conducting material, placed between the outside disk and the screw.

lhe normal position of the circuitbreaker M is in contact with the inner end or point,R, of the screw.

Sis a thin flat spring secured at one extremity to the armature, the other or free end bearing against the frame. The function of this spring is to return the armature to its normal position after the circuit has been broken, and thereby insure contact between point B and circuit-breaker M.

T is the bell-hammer, which is formed integral with or secured to the upper extremity of one of the arms of the armature.

U is an ordinary binding-post,which is in contact with the frame, and V is a similar post insulated from the frame by hard rubber disks W.

X is a conducting-wire connected to the bottom of the post V and extending within the helix, and Y is also a condncting-wire, one extremity of which is secured in contact with the screw 0, the other end being connected within the helix.

The operation of my invention is as follows:

The battery-wires are attached to the post U V. The current passes through the conductor X into the helix, thence through the conductor Y into the screw 0, into the circuit-breaker, down through the armature into the frame, and thence through the post U, when the circuit is complete. The magnetization being now effected,the armature is attracted by the magnet and the circuit thereby broken.

I am of course aware that the details of operation above set forth are, broadly, old, but the special arrangement of the several parts of the device illustrated is believed to be novel, and an electric bell is thereby provided,which is not only very compact and convenient, but

ICO

also complete in every respect, and moreover very economical in cost.

armature to its normal position, in combina- 15 tion with the single helix secured to the frame by a yoke having an upwardly-projecting post adapted to support the bell and the point of contact insulated from the frame and passed through a lug projecting upwardly therefrom, 20 substantially as shown and described.

I11 testimony whereof I affix my signature in presence of two witnesses. I

HENRY B. PORTER.

Witnesses:

WM. D. BISHOP, Jr., S. S. WILLIAMSON. 

